Quick Answer. A low hemoglobin count, also known as anemia, is caused by pregnancy, a menstrual period, a diet low in iron, blood loss, or a disease that causes the body to produce fewer red blood cells or to destroy red blood cells. According to the Mayo Clinic, medications also sometimes cause anemia.
A cytotoxic T cell (also known as TC, cytotoxic T lymphocyte, CTL, T-killer cell, cytolytic T cell, CD8+ T-cell or killer T cell) is a T lymphocyte (a type of white blood cell) that kills cancer cells, cells that are infected (particularly with viruses), or cells that are damaged in other ways.
function in immunity. Two main types of mature T cellsâcytotoxic T cells and helper T cellsâare known. Some scientists hypothesize the existence of a third type of mature T cell called regulatory T cells. Some T cells recognize class I MHC molecules on the surface of cells; others bind to class II molecules.